win10系统总会出现这个错误，是系统问题吗
C:\Users\lenovo\Documents\Untitled2.c||In function `main':|C:\Users\lenovo\Documents\Untitled2.c|9|error: 'for' loop initial declaration used outside C99 mode|
C:\Users\lenovo\Documents\Untitled2.c|13|error: 'for' loop initial declaration used outside C99 mode|
||=== Build finished: 2 errors, 0 warnings ===|
